jcolwell
Offline
• • • • • • •
Upload & Sell: On
|
Kameratrollet wrote:
Didn't know about photodo. Did a search at archive.org. I found 50/1.8 STM and 50/1.2L USM but no 50/1.0L USM. Had to be logged in also (in the past).
The original photodo database was developed by a Hassy tech, working in his spare time, see note [1]. It was the first, more-or-less reliable source of resolution data (weighted-MTF) for a wide variety of lenses; all brands, all qualities, with optical performance ranging from supernatural to ink bottle. By my count (i.e. in my copied database) there were 398 lenses, with tested MFT curves for all of them, plus other data for many.
Wait a sec... I found the old info for the EF 50/1.0 L, on the new site:
http://www.photodo.com/lens/Canon-EF-50mm-f10-L-USM-21
For distortion and CA, it has nothing. Anyway, it's still one of the best lens performance data sources for many highly-desirable Alt lenses. The attached image shows a portion of my spreadsheet, with the EF 50/1.0 L USM listed fourth down, in the wMFT = 3.9 group.
___________________________
Note [1] (quotation from old photodo site, may be still on new site)
"Understanding the MTF graphs, numbers and grades
We have been testing lenses with Hasselblads Ealing MTF equipment since 1991. All MTF reports are made with the same equipment and by the same operator (Per Nordlund at Victor Hasselblad AB). So far we have tested lenses only at infinity. We measure MTF at 10, 20 and 40 lp/mm, where 10 lp/mm (line pairs/ mm) means 10 black lines with 10 white lines in between, for each millimeter.
The lens with the highest MTF in our tests (so far) is the Canon EF 200/1,8L USM... "
Lens weighted MTF data from old photodo, screenshot of my database with copied photodo data
|
